Tricky Tripple

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Last Level Complete.Congratulations!

Tricky Triple:
Click the squares to cycle through icons and put a square, circle, or
triangle in every white square.
When 3 adjacent white squares are in a line (horizontally, vertically,
or diagonally) then exactly 2 of the squares must contain the same symbol.
Grayed-out and black squares cannot be changed.
A solved puzzle is shown below. Each puzzle has a unique solution.
All puzzles were designed by Erich Friedman.